ExoClock

The Star
Simbad GAIA 2MASS	HAT-P-27 DR2 1159336403336463872 J14510418+0556505
RA	14:51:04.1870		DEC	+05:56:50.548
Parallax 4.992 mas		P.M. RA -28.621 mas/y		P.M. DEC -2.757 mas/y
Mag_V 12.19	Mag_R 11.98	Mag_I 11.23	Mag_J 10.626	Mag_H 10.249	Mag_K 10.109
Mag_G 11.956		Mag_{G_BP} 12.419		Mag_{G_RP} 11.352
^*Calculated from GAIA magnitudes.

Ephemeris - Verified
Kokori et al. 2021
Mid-time 2456638.93852 ± 0.00012 BJD_TDB
Period 3.0395778 ± 2.5e-07 days
Transit Parameters
Béky et al. 2011
R_p/R_s 0.119 ± 0.003	a/R_s 9.7 +0.4 -0.5		i 84.7 +0.4 -0.7 deg
R_p/R_s 0.119 ± 0.003	e 0.08 +0.05 -0.05		ω 63.0 +64.0 -64.0 deg
Depth_R^* 14.08 mmag		Duration^* 1.68 hours
^Calculated from the other parameters, using PyLightcurve. ^*Adjusted to produce a duration that matches the observations.
Limb Darkening Parameters
Béky et al. 2011
T_eff 5300.0 +90.0 -90.0 K	Log(g) 4.51 +0.04 -0.04 cm/s²		Fe/H 0.29 +0.1 -0.1 dex

ExoClock Status
Observing Priority ExoClock Observations (Recent) Space Observations Literature Mid-times ETD Observations O-C minutes		LOW 29 (8) 9 0.16±0.23

ExoClock Observations

Observation Date	Observer Observatory	Telescope Camera / Filter / Exp [s]	O-C minutes
2022-06-30	Jean-Pascal Vignes Deep Sky Chile	Planewave CDK400 QHYCCD 600M / Lum / 60.0	-2.6 ± 0.9
2022-06-20	Paolo Arcangelo Matassa P:M.P.H.R. Deep Sky (K81)	Ritchey Chretien 40cm-F5.3 CCD ICX453AQ / Lum / 90.0	-1.0 ± 2.7
2022-06-14	Stefano Lora MarSEC	Ritchey Chrétien Moravian G2 Mark II / Clear / 120.0	3.4 ± 1.3
2022-04-15	Adam Popowicz Otivar dome2	Newton 12" ASA ASI ZWO 1600MM / R / 65.0	5.5 ± 2.4
2022-04-12	Paolo Arcangelo Matassa P:M.P.H.R. Deep Sky (K81)	Ritchey Chretien 40cm-F5.3 CCD ICX453AQ / Lum / 120.0	1.4 ± 1.9
2022-04-05	Marc SERRAU A77 Dauban	Celestron 11 ST8-XME / Clear / 120.0	0.9 ± 1.6
2022-02-16	Yves Jongen Deep Sky Chile	Plane Wave CDK 17" Moravian 4G / Lum / 120.0	-1.4 ± 1.0
2022-02-07	Adrian Jones Private Observatory (I64)	Meade ACF 30cm QSI 583 / R / 150.0	0.6 ± 2.0
2021-06-09	Yves Jongen Deep Sky Chile	Plane Wave CDK 17" Moravian 4G / R / 120.0	0.2 ± 1.2
2021-06-02	Mario Billiani starbase	Unistellar eVscope Sony IMX224 / Clear / 119.09991	0.9 ± 5.8
2021-05-24	Carmelo Falco GAL Hassin Robotic Telescope 2 (GRT2) - Multiband	Giacometti-Fogale RC16 - 2 Andor Apogee Aspen CG16M / g' / 90.0	0.4 ± 2.4
2021-05-24	Carmelo Falco GALHassin Robotic Telescope 2 (GRT2)	Giacometti-Fogale RC16 Andor Apogee Aspen CG16M / Lum / 60.0	-1.1 ± 2.9
2021-04-18	Billy Edwards Haleakala Observatory	LCO Meade SBIG STX6303 / r' / 59.937	-0.2 ± 1.3
2021-04-12	Yves Jongen Deep Sky Chile	Plane Wave CDK 17" Moravian 4G / R / 120.0	0.9 ± 1.0
2021-04-09	Yves Jongen Deep Sky Chile	Plane Wave CDK 17" Moravian 4G / V / 120.0	3.8 ± 1.2
2021-03-28	Marc Deldem Les Barres Observatory	Celestron C11 SBIG ST10-XME / Clear / 120.0	-1.1 ± 1.0
2021-03-28	Carmelo Falco GALHassin Robotic Telescope 2 (GRT2)	Giacometti-Fogale RC16 Andor Apogee Aspen CG16M / g' / 90.0	-2.3 ± 1.9
2021-03-25	Yves Jongen Rasteau Observatory	Plane Wave CDK 17" SBIG STXL 11002 / Lum / 120.0	2.9 ± 1.0
2021-03-25	Alberto Tomatis Alto-Observatory	RC STL 6303 / Lum / 60.0	1.2 ± 2.9
2021-03-25	Ivo Peretto MarSEC Marana Space Explorer Center	R-C Moravia G2-1600 MkII / Clear / 60.0	0.2 ± 2.2
2021-03-25	Mauro Caló Cavallino	RC SBIG ST10 / Lum / 60.0	-0.1 ± 4.3
2021-03-25	Adrian Jones Private Observatory (I64)	Meade ACF 30cm QSI 583 / R / 100.0	-0.7 ± 2.3
2021-03-15	Rauno Neito Tartu Observatory	Planewave CDK 12.5 Apogee Alta U42 / R / 60.0	0.6 ± 1.4
2020-05-22	Matthias Mallonn STELLA	Cassegrain optical CCD photometer / r' / 50.0	-1.2 ± 0.6	- Data available
2020-05-19	Matthias Mallonn STELLA	Cassegrain optical CCD photometer / r' / 50.0	0.3 ± 0.7	- Data available
2020-05-15	John Savage Z42 Rushay Farm Observatory	Celestron 14Edge ZWO ASI6200MM / Clear / 120.0	1.3 ± 1.2	- Data available
2020-05-15	Matthias Mallonn STELLA	Cassegrain optical CCD photometer / r' / 50.0	0.2 ± 0.6	- Data available
2020-05-15	Francois Regembal HRTobs	Astrosib RC360 SBIG STX 16803 / Lum / 60.0	-2.0 ± 2.9	- Data available
2017-05-29	Alessandro Marchini Astronomical Observatory, University of Siena	Mak-Cas 0.3m f/5.6 Sbig STL-6303 / R / 300.0	2.3 ± 2.2

Literature Mid-times

Observation Date	Mid-time	Time format	Reference	O-C minutes
2013-06-03	2456447.44571 ± 0.0003	BJD_TDB	Seeliger et al. 2015	0.8 ± 0.4
2012-04-25	2456043.18095 ± 0.00135	BJD_TDB	Seeliger et al. 2015	-0.5 ± 1.9
2012-04-01	2456018.86457 ± 0.00232	BJD_TDB	Seeliger et al. 2015	-0.1 ± 3.3
2011-05-21	2455702.74876 ± 0.00039	BJD_TDB	Sada et al. 2012	0.3 ± 0.6
2011-05-06	2455687.55122 ± 0.00051	BJD_TDB	Seeliger et al. 2015	0.8 ± 0.7
2011-04-08	2455660.19481 ± 0.00116	BJD_TDB	Seeliger et al. 2015	0.5 ± 1.7
2011-04-05	2455657.15333 ± 0.00107	BJD_TDB	Seeliger et al. 2015	-2.2 ± 1.5
2010-06-14	2455362.31489 ± 0.00023	HJD_UTC	Anderson et al. 2011	-0.3 ± 0.3
2009-12-20	2455186.01879 ± 0.00054	BJD_UTC	Béky et al. 2011	-1.1 ± 0.8

HAT-P-27b

Discovered by: Béky et al. 2011

ExoClock Observations

Literature Mid-times